GB1405789A - Electroacoustic transducer - Google Patents
Electroacoustic transducerInfo
- Publication number
- GB1405789A GB1405789A GB5063772A GB5063772A GB1405789A GB 1405789 A GB1405789 A GB 1405789A GB 5063772 A GB5063772 A GB 5063772A GB 5063772 A GB5063772 A GB 5063772A GB 1405789 A GB1405789 A GB 1405789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- electrode
- electrodes
- electret
- fixed electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920000642 polymer Polymers 0.000 abstract 5
- 239000011347 resin Substances 0.000 abstract 3
- 229920005989 resin Polymers 0.000 abstract 3
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 2
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 abstract 1
- 239000002033 PVDF binder Substances 0.000 abstract 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 abstract 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000000996 additive effect Effects 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000008602 contraction Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 abstract 1
- XUCNUKMRBVNAPB-UHFFFAOYSA-N fluoroethene Chemical compound FC=C XUCNUKMRBVNAPB-UHFFFAOYSA-N 0.000 abstract 1
- 239000000178 monomer Substances 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 abstract 1
- 229920006254 polymer film Polymers 0.000 abstract 1
- 239000004926 polymethyl methacrylate Substances 0.000 abstract 1
- 239000005033 polyvinylidene chloride Substances 0.000 abstract 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/005—Piezoelectric transducers; Electrostrictive transducers using a piezoelectric polymer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/013—Electrostatic transducers characterised by the use of electrets for loudspeakers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S310/00—Electrical generator or motor structure
- Y10S310/80—Piezoelectric polymers, e.g. PVDF
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Headphones And Earphones (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Treatments Of Macromolecular Shaped Articles (AREA)
Abstract
1405789 Electroacoustic transducer KUREHA KAGAKU KOGYO KK 2 Nov 1972 [4 Nov 1971] 50637/72 Heading H4J An electroacoustic transducer which relies upon both capacitor and piezoelectric effects has a vibratory diaphragm 12 (Fig. 4-1) of piezoelectric polymer which develops expansion and contraction movements parallel to its faces when an alternating potential difference is applied to two electrodes 13, 13<SP>1</SP> one on each face. A fixed electrode 11 is located in spaced relation to the diaphragm 12. When an input signal is applied between the two electrodes on the diaphragm 2 and between the fixed electrode 11 and the nearer electrode 13<SP>1</SP> on the diaphragm 12a combination, additive, vibration of the diaphragm 12 is caused by the piezoelectric effect of the diaphragm 12 and by the attractive and repulsive forces between the fixed electrode 11 and the nearer electrode 13<SP>1</SP> on the diaphragm 12. Preferably the fixed electrode 11 carries an electret 10. If not, a polarization potential is applied between the fixed electrode 11 and the nearer electrode 13<SP>1</SP> of the diaphragm 12. The diaphragm 12 is curved, even in its contracted state. In some arrangements it may be fixed locally, e.g. at a central point thereof. The transducer may be used in headphones, loudspeakers, microphones and pickups. A push-pull transducer (Fig. 5) has a piezoelectric polymer film diaphragm 12 electroded on both sides. Two fixed electrodes 9, 9<SP>1</SP> each have an electret confronting the diaphragm 12. The secondary of a transformer 15 has one tap connected to one fixed electrode 9 and to the remote electrode on the diaphragm 12 and the other tap connected to the other fixed electrode 9<SP>1</SP> and to the remote electrode on the diaphragm 12. A headphone (Fig. 8) comprises an aluminium electrode 11 with an electret 10 spaced from a piezoelectric polymer diaphragm 12 having electrodes on its opposite sides. A signal source is connected between the electrode 11 and a diaphragm electrode and between the two electrodes on the diaphragm. A transformer is unnecessary for normal use. The piezoelectric polymer is preferably formed from a polyvinylidene fluoride or a copolymer of vinylidene fluoride and at least one monomer copolymerizable with vinylidene fluoride. Alternative polymers are vinylidene chloride resin, vinyl fluoride resin, or vinyl chloride resin. A non-oriented film may be used after being subjected to a D.C. field at elevated temperature. The non-oriented film may be axially oriented, by stretching, before application of the D.C. field. The electret, if used, is preferably made from 70% by weight polyvinylidene chloride, balance polymethyl methacrylate. The electret properties are obtained by treating the polymer sheet for 30 mine. under the application of a D.C. field of 1000 kV/cm. at 90 C. and then cooling to room temperature.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP46087854A JPS5221364B2 (en) | 1971-11-04 | 1971-11-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1405789A true GB1405789A (en) | 1975-09-10 |
Family
ID=13926458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5063772A Expired GB1405789A (en) | 1971-11-04 | 1972-11-02 | Electroacoustic transducer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3894198A (en) |
| JP (1) | JPS5221364B2 (en) |
| CA (1) | CA989972A (en) |
| FR (1) | FR2158571B1 (en) |
| GB (1) | GB1405789A (en) |
| NL (1) | NL7214888A (en) |
Families Citing this family (51)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2199430A5 (en) * | 1972-09-08 | 1974-04-05 | Anvar | |
| JPS5745760Y2 (en) * | 1974-02-18 | 1982-10-08 | ||
| JPS50117412A (en) * | 1974-02-18 | 1975-09-13 | ||
| US3980838A (en) * | 1974-02-20 | 1976-09-14 | Tokyo Shibaura Electric Co., Ltd. | Plural electret electroacoustic transducer |
| JPS5215972B2 (en) * | 1974-02-28 | 1977-05-06 | ||
| US3970862A (en) * | 1974-06-25 | 1976-07-20 | The United States Of America As Represented By The Secretary Of The Navy | Polymeric sensor of vibration and dynamic pressure |
| JPS51101927U (en) * | 1975-02-14 | 1976-08-16 | ||
| JPS5215319A (en) * | 1975-07-25 | 1977-02-04 | Matsushita Electric Ind Co Ltd | Electric sound convertor |
| GB1520118A (en) * | 1975-08-11 | 1978-08-02 | Rank Organisation Ltd | Transducers |
| US4146800A (en) * | 1975-10-08 | 1979-03-27 | Gregory Stephen E | Apparatus and method of generating electricity from wind energy |
| US4170185A (en) * | 1978-01-09 | 1979-10-09 | Lectret S.A. | Preventing marine fouling |
| US4207442A (en) * | 1978-05-15 | 1980-06-10 | Freeman Miller L | Driver circuit for electrostatic transducers |
| JPS5512508A (en) * | 1978-07-10 | 1980-01-29 | Kureha Chem Ind Co Ltd | Information recording sheet |
| US4331840A (en) * | 1980-02-22 | 1982-05-25 | Lectret S.A. | Electret transducer with tapered acoustic chamber |
| GB2079054B (en) * | 1980-06-30 | 1984-02-22 | Tokyo Shibaura Electric Co | Electret device |
| US4440027A (en) * | 1982-05-26 | 1984-04-03 | Ford Motor Company | Velocity and mass air flow sensor |
| DE3437488A1 (en) * | 1984-10-12 | 1986-04-17 | Richard Wolf Gmbh, 7134 Knittlingen | SOUND TRANSMITTER |
| US4868447A (en) * | 1987-09-11 | 1989-09-19 | Cornell Research Foundation, Inc. | Piezoelectric polymer laminates for torsional and bending modal control |
| US4985926A (en) * | 1988-02-29 | 1991-01-15 | Motorola, Inc. | High impedance piezoelectric transducer |
| US5558298A (en) * | 1994-12-05 | 1996-09-24 | General Electric Company | Active noise control of aircraft engine discrete tonal noise |
| US5949892A (en) * | 1995-12-07 | 1999-09-07 | Advanced Micro Devices, Inc. | Method of and apparatus for dynamically controlling operating characteristics of a microphone |
| US6140740A (en) * | 1997-12-30 | 2000-10-31 | Remon Medical Technologies, Ltd. | Piezoelectric transducer |
| US20030036746A1 (en) | 2001-08-16 | 2003-02-20 | Avi Penner | Devices for intrabody delivery of molecules and systems and methods utilizing same |
| US6760455B2 (en) * | 2000-07-13 | 2004-07-06 | American Technology Corporation | Electrostatic loudspeaker with a distributed filter |
| AT410498B (en) * | 2001-02-20 | 2003-05-26 | Akg Acoustics Gmbh | ELECTROACOUSTIC CAPSULE |
| US6978032B2 (en) * | 2001-11-29 | 2005-12-20 | Matsushita Electric Industrial Co., Ltd. | Piezoelectric speaker |
| GB0204572D0 (en) * | 2002-02-27 | 2002-04-10 | Univ Warwick | Non contacting air-coupled ultrasonic inspection system for food and drinks |
| US7580750B2 (en) * | 2004-11-24 | 2009-08-25 | Remon Medical Technologies, Ltd. | Implantable medical device with integrated acoustic transducer |
| US7522962B1 (en) | 2004-12-03 | 2009-04-21 | Remon Medical Technologies, Ltd | Implantable medical device with integrated acoustic transducer |
| EP1880403B1 (en) * | 2005-05-02 | 2012-06-13 | Epcos Ag | Capacitive rf-mems device with integrated decoupling capacitor |
| US20080212807A1 (en) * | 2005-06-08 | 2008-09-04 | General Mems Corporation | Micromachined Acoustic Transducers |
| US7570998B2 (en) * | 2005-08-26 | 2009-08-04 | Cardiac Pacemakers, Inc. | Acoustic communication transducer in implantable medical device header |
| US7615012B2 (en) * | 2005-08-26 | 2009-11-10 | Cardiac Pacemakers, Inc. | Broadband acoustic sensor for an implantable medical device |
| JP2008042869A (en) * | 2005-10-05 | 2008-02-21 | Seiko Epson Corp | Electrostatic ultrasonic transducer, ultrasonic speaker, audio signal reproduction method, superdirective acoustic system, and display device |
| WO2008011577A2 (en) | 2006-07-21 | 2008-01-24 | Cardiac Pacemakers, Inc. | Ultrasonic transducer for a metallic cavity implanted medical device |
| US7912548B2 (en) * | 2006-07-21 | 2011-03-22 | Cardiac Pacemakers, Inc. | Resonant structures for implantable devices |
| US8825161B1 (en) | 2007-05-17 | 2014-09-02 | Cardiac Pacemakers, Inc. | Acoustic transducer for an implantable medical device |
| AU2008266678B2 (en) * | 2007-06-14 | 2013-06-20 | Cardiac Pacemakers, Inc. | Multi-element acoustic recharging system |
| TWI343756B (en) * | 2009-08-10 | 2011-06-11 | Ind Tech Res Inst | Flat loudspeaker structure |
| US20100103115A1 (en) * | 2008-10-24 | 2010-04-29 | Sony Ericsson Mobile Communications Ab | Display arrangement and electronic device |
| CN101754078A (en) * | 2008-12-12 | 2010-06-23 | 志丰电子股份有限公司 | Electret back-electrode type double-diaphragm electroacoustic actuator and manufacturing method thereof |
| US8520869B2 (en) * | 2010-03-29 | 2013-08-27 | Panasonic Corporation | Piezoelectric acoustic transducer |
| JP5195895B2 (en) * | 2010-12-27 | 2013-05-15 | 株式会社村田製作所 | Piezoelectric sounding parts |
| CN102651836A (en) * | 2011-02-28 | 2012-08-29 | 千如电机工业股份有限公司 | Audio Drivers for Flat Electroacoustic Actuators |
| EP2512029A1 (en) * | 2011-04-11 | 2012-10-17 | ABC Taiwan Electronics Corp. | Audio signal driver for flat sound generator |
| DE102012221833A1 (en) * | 2012-11-29 | 2014-06-05 | Robert Bosch Gmbh | Transducer with at least one electrode of a first type, an electrode of a second type and at least one ferroelectret |
| JP6278619B2 (en) * | 2013-06-14 | 2018-02-14 | 古河電気工業株式会社 | Vibration generator |
| DE102013222231A1 (en) | 2013-10-31 | 2015-04-30 | Sennheiser Electronic Gmbh & Co. Kg | receiver |
| KR20160068059A (en) * | 2014-12-04 | 2016-06-15 | 삼성디스플레이 주식회사 | Piezoelectric element comprising mesoporous piezoelectric thin film |
| US10120449B2 (en) | 2015-08-25 | 2018-11-06 | Immersion Corporation | Parallel plate actuator |
| KR101703608B1 (en) * | 2015-08-28 | 2017-02-07 | 현대자동차 주식회사 | Detachable microphone and method of manufacturing the same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE524082C (en) * | 1928-09-07 | 1931-05-01 | Siemens & Halske Akt Ges | Loudspeaker with several electrical drive systems working according to different principles |
| US2478223A (en) * | 1946-03-01 | 1949-08-09 | Clarkstan Corp | Electrostrictive translator |
| JPS4815867B1 (en) * | 1969-08-28 | 1973-05-17 | ||
| US3646413A (en) * | 1970-09-25 | 1972-02-29 | Avco Corp | Piezoelectric-driven variable capacitor |
-
1971
- 1971-11-04 JP JP46087854A patent/JPS5221364B2/ja not_active Expired
-
1972
- 1972-10-31 CA CA155,743A patent/CA989972A/en not_active Expired
- 1972-11-02 GB GB5063772A patent/GB1405789A/en not_active Expired
- 1972-11-03 NL NL7214888A patent/NL7214888A/xx not_active Application Discontinuation
- 1972-11-06 FR FR7239244A patent/FR2158571B1/fr not_active Expired
- 1972-11-06 US US303894A patent/US3894198A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE2253721A1 (en) | 1973-05-24 |
| NL7214888A (en) | 1973-05-08 |
| CA989972A (en) | 1976-05-25 |
| FR2158571A1 (en) | 1973-06-15 |
| JPS4853713A (en) | 1973-07-28 |
| DE2253721B2 (en) | 1976-02-12 |
| US3894198A (en) | 1975-07-08 |
| JPS5221364B2 (en) | 1977-06-10 |
| FR2158571B1 (en) | 1978-11-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |